\ifx\wholebook\relax \else

\documentclass{article}

\input{../common-en.tex}

\setcounter{page}{1}

\begin{document}

\title{Algebra}

\author{Liu Xinyu
\thanks{{\bfseries Liu Xinyu} \newline
  Email: liuxinyu95@gmail.com}}

\maketitle
\fi

\markboth{Algebra}{Mathematics of Programming}

\ifx\wholebook\relax
\chapter{Algebra}
\numberwithin{Exercise}{chapter}
\fi

this is the placeholder for the EN draft.

\ifx\wholebook\relax \else
\begin{thebibliography}{99}

\end{thebibliography}

\expandafter\enddocument
%\end{document}

\fi
